1#ifndef _KERNEL_EVENTS_INTERNAL_H
2#define _KERNEL_EVENTS_INTERNAL_H
3
4#include <linux/hardirq.h>
5#include <linux/uaccess.h>
6
7
8
9#define RING_BUFFER_WRITABLE 0x01
10
11struct ring_buffer {
12 atomic_t refcount;
13 struct rcu_head rcu_head;
14#ifdef CONFIG_PERF_USE_VMALLOC
15 struct work_struct work;
16 int page_order;
17#endif
18 int nr_pages;
19 int overwrite;
20 int paused;
21
22 atomic_t poll;
23
24 local_t head;
25 local_t nest;
26 local_t events;
27 local_t wakeup;
28 local_t lost;
29
30 long watermark;
31 long aux_watermark;
32
33 spinlock_t event_lock;
34 struct list_head event_list;
35
36 atomic_t mmap_count;
37 unsigned long mmap_locked;
38 struct user_struct *mmap_user;
39
40
41 local_t aux_head;
42 local_t aux_nest;
43 local_t aux_wakeup;
44 unsigned long aux_pgoff;
45 int aux_nr_pages;
46 int aux_overwrite;
47 atomic_t aux_mmap_count;
48 unsigned long aux_mmap_locked;
49 void (*free_aux)(void *);
50 atomic_t aux_refcount;
51 void **aux_pages;
52 void *aux_priv;
53
54 struct perf_event_mmap_page *user_page;
55 void *data_pages[0];
56};
57
58extern void rb_free(struct ring_buffer *rb);
59
60static inline void rb_free_rcu(struct rcu_head *rcu_head)
61{
62 struct ring_buffer *rb;
63
64 rb = container_of(rcu_head, struct ring_buffer, rcu_head);
65 rb_free(rb);
66}
67
68static inline void rb_toggle_paused(struct ring_buffer *rb, bool pause)
69{
70 if (!pause && rb->nr_pages)
71 rb->paused = 0;
72 else
73 rb->paused = 1;
74}
75
76extern struct ring_buffer *
77rb_alloc(int nr_pages, long watermark, int cpu, int flags);
78extern void perf_event_wakeup(struct perf_event *event);
79extern int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event,
80 pgoff_t pgoff, int nr_pages, long watermark, int flags);
81extern void rb_free_aux(struct ring_buffer *rb);
82extern struct ring_buffer *ring_buffer_get(struct perf_event *event);
83extern void ring_buffer_put(struct ring_buffer *rb);
84
85static inline bool rb_has_aux(struct ring_buffer *rb)
86{
87 return !!rb->aux_nr_pages;
88}
89
90void perf_event_aux_event(struct perf_event *event, unsigned long head,
91 unsigned long size, u64 flags);
92
93extern struct page *
94perf_mmap_to_page(struct ring_buffer *rb, unsigned long pgoff);
95
96#ifdef CONFIG_PERF_USE_VMALLOC
97
98
99
100
101
102
103static inline int page_order(struct ring_buffer *rb)
104{
105 return rb->page_order;
106}
107
108#else
109
110static inline int page_order(struct ring_buffer *rb)
111{
112 return 0;
113}
114#endif
115
116static inline unsigned long perf_data_size(struct ring_buffer *rb)
117{
118 return rb->nr_pages << (PAGE_SHIFT + page_order(rb));
119}
120
121static inline unsigned long perf_aux_size(struct ring_buffer *rb)
122{
123 return rb->aux_nr_pages << PAGE_SHIFT;
124}
125
126#define __DEFINE_OUTPUT_COPY_BODY(advance_buf, memcpy_func, ...) \
127{ \
128 unsigned long size, written; \
129 \
130 do { \
131 size = min(handle->size, len); \
132 written = memcpy_func(__VA_ARGS__); \
133 written = size - written; \
134 \
135 len -= written; \
136 handle->addr += written; \
137 if (advance_buf) \
138 buf += written; \
139 handle->size -= written; \
140 if (!handle->size) { \
141 struct ring_buffer *rb = handle->rb; \
142 \
143 handle->page++; \
144 handle->page &= rb->nr_pages - 1; \
145 handle->addr = rb->data_pages[handle->page]; \
146 handle->size = PAGE_SIZE << page_order(rb); \
147 } \
148 } while (len && written == size); \
149 \
150 return len; \
151}
152
153#define DEFINE_OUTPUT_COPY(func_name, memcpy_func) \
154static inline unsigned long \
155func_name(struct perf_output_handle *handle, \
156 const void *buf, unsigned long len) \
157__DEFINE_OUTPUT_COPY_BODY(true, memcpy_func, handle->addr, buf, size)
158
159static inline unsigned long
160__output_custom(struct perf_output_handle *handle, perf_copy_f copy_func,
161 const void *buf, unsigned long len)
162{
163 unsigned long orig_len = len;
164 __DEFINE_OUTPUT_COPY_BODY(false, copy_func, handle->addr, buf,
165 orig_len - len, size)
166}
167
168static inline unsigned long
169memcpy_common(void *dst, const void *src, unsigned long n)
170{
171 memcpy(dst, src, n);
172 return 0;
173}
174
175DEFINE_OUTPUT_COPY(__output_copy, memcpy_common)
176
177static inline unsigned long
178memcpy_skip(void *dst, const void *src, unsigned long n)
179{
180 return 0;
181}
182
183DEFINE_OUTPUT_COPY(__output_skip, memcpy_skip)
184
185#ifndef arch_perf_out_copy_user
186#define arch_perf_out_copy_user arch_perf_out_copy_user
187
188static inline unsigned long
189arch_perf_out_copy_user(void *dst, const void *src, unsigned long n)
190{
191 unsigned long ret;
192
193 pagefault_disable();
194 ret = __copy_from_user_inatomic(dst, src, n);
195 pagefault_enable();
196
197 return ret;
198}
199#endif
200
201DEFINE_OUTPUT_COPY(__output_copy_user, arch_perf_out_copy_user)
202
203
204extern struct perf_callchain_entry *
205perf_callchain(struct perf_event *event, struct pt_regs *regs);
206
207static inline int get_recursion_context(int *recursion)
208{
209 int rctx;
210
211 if (in_nmi())
212 rctx = 3;
213 else if (in_irq())
214 rctx = 2;
215 else if (in_softirq())
216 rctx = 1;
217 else
218 rctx = 0;
219
220 if (recursion[rctx])
221 return -1;
222
223 recursion[rctx]++;
224 barrier();
225
226 return rctx;
227}
228
229static inline void put_recursion_context(int *recursion, int rctx)
230{
231 barrier();
232 recursion[rctx]--;
233}
234
235#ifdef CONFIG_HAVE_PERF_USER_STACK_DUMP
236static inline bool arch_perf_have_user_stack_dump(void)
237{
238 return true;
239}
240
241#define perf_user_stack_pointer(regs) user_stack_pointer(regs)
242#else
243static inline bool arch_perf_have_user_stack_dump(void)
244{
245 return false;
246}
247
248#define perf_user_stack_pointer(regs) 0
249#endif
250
251#endif
252
